Telephone system



April 8, 1930. o. ANDERS TELEPHONE SYSTEM Filed July: 11. 1927 ETD, .NNMF

Nw. M

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EN www Irma-5 l l [mi Enders Patented Apr. 8, k1930 y f UNITED lLsg'r-A'res PATENT- OFFICE v OTTO ANDERS, F BERLIN, GERMANKY,Y` ASSIGNOR TO SIEMENS HALSKE AKTENGE- ,y

SELLSCHAFT, WERNERWERK, 0F SIEMENSSTADT, NEAR BERLIN, GERMAN Y'l l TELEPHONE SYSTEM. Y

Application med Ju1y11, 1927', semina. 204,681, and in Germany Juiy 23, 192s.-

The invention relates to ra` circuitarrangement for automatic telephone systems and subscribers lines having dilerenttraiiic facilities, the incoming ycalls 'of different values being dealt with by an operator.

The object of the invention is to enable subscribers having dili'erent traic facilities to be connected to the samelinal selector of an automatic telephonev exchange, in order to avoid having to provide special switches or groups of switches, to whichare connected vthe subscribers entitled to certain calls, for

example, main exchange calls, etc. To achievel this, according to the invention, the impulse sender at theoperators position is provided with switching means, which come into action and prevent the call being set up when an attempt is made to set up a connection between a line of a certain value (for example main exchange line)y and a station not entitled to these connections.` This arrangement is of particular importance for private branch exchanges, in which calls of different value (main exchange calls, ycalls over cross connecting lines, record lines, etc.) are dealt with by anoperator ofthe branch exchange in setting up the connections for calls to the extension stations.

By way of example, lthe drawing shows diagrammatically a circuit arrangement according to the invention, in which the branch relay El.

exchange operator is provided with a key setfor setting up a connection over selecting devices, and this key set controlsY a number sender. Furthermore, by throwing a key, the number sender in the impulse circuit is re# placed by a number dial or a device controlled by the latter. The number sender is only partially shown, thus by way of example only the switching means are shown that are used for preventing certain connections: in

conjunction withthe row of keys for theltens selection, so that the blockingisei'ected in certain decades. r

When a subscriber of the main exchange y number sender.

calling exchange line and .ascertainsv the wanted subscriber. The connection to a calling exchange line is brought aboutl bythe operation of the speaking key Afr. Only a back contact of this key Afro is shown in the drawing, and this contact serves to bring down the relay H after connection has been made to the calling exchange line, whereupon the calling lamp AL is extinguished. On

pressing the starting key A25 one windingl of( the number-sender-starter relay Z is energized. The Z contact prepares a circuit for the E relay. As soon as a units key of the number sender is pressed springs E(Z) are closed,vthereby closing the circuit of relay El. Relay El operates and closes contacts e1 II, which closes the circuit of'relay E. Relay E operates and starts the operation of the (The number sender is not shown. A suitable one is shown and de# scribed in ,detail in the German Patent No.` 377,603 issued June 22,1923). A relay V(not shown) in the number vsender closes contacts 2(Z) to provide a holding circuit for- 'In the example shown, all subscribers not entitled to be-iconnected to an exchange line lare reached by pressing Vthe tens keys 1 9,

while the outgoing exchange linesv are connected to the level O. The keys 1v-9 are connected in parallel in the circuit of the ref lay ZU, the circuit of which is made dependenton the operation of the relay E and relay R2 (not shown). The relay E having been energized, having operated whenl the branch exchange operatorpressed a key in the units row of keys after receiving a call over the main exchangeline, the contacts e III are Should however the private distance ex-V also closed and a circuit for the ZU relay is prepared. If the calling subscriber requests to be connected to a limited facilities subscriber and the corresponding tens key is pressed, then the ZU relay is also operated over the actuated key, (one of the keys l1--9). This relay ZU opens the control circuit by opening the contact zu I while the contact zu III connects up a supervisory signal KL for the operator,thereby notifying the operator that thecalled subscriber is not entitled to be connected to a main exchange. line. By means of her head set, the operator may then inform the calling party that the wanted subscriber (cannot be reached.

Overcertain lines (cross connecting lines) it shall be possible to reach all the subscribers of the branch exchange. For example, if the lighting of the-lamp FL has notified the branch exchange operator that a call has arrived from a private distant exchange over a cross connecting line such as line ZpFA and a subscriber of the branch exchange is wanted, she presses the key FT which causes relay Z1 to operate over one winding and prepare a circuit for the relay E2 at contacts e1. The latter is operated as soon as the pressing of a units key has started up the number sender. The keys 1-9 can be effectively operated, so that impulse transmission can take place.

changerask forone of the exchange lines, which are connected to the level O, the pressing of the key O also causes the relay ZU to operate and to interrupt the impulse transmission in the manner described.

To render the service quite reliable, the operators position can be provided with a number dial in' addition to the number sender. In that case, the switching means and the circuit for positioning the nal selector are placed under the control of the number dial by throwing the key US.

When the lighting of the lamp AL gives the branch exchange a call signal over an exchange line' for t-he subscribers connected to the digits etw-9, who have limited facilities, the operator connects her head set to the calling main exchange line and asks who is the wanted subscriber. By actuating the starting key AT, a circuit is closed for one wind-` ing of the relay Z, which closes the contact e and so prepares a circuit for the relay E. During the forward rotation of the branch exchange operators dial, olf-normal contacts e(N) close the circuit of the relay V, which at its three contacts controls the following circuits: The contacts @I (N) causes the relay E 1 to operate, hence the relay E is also operated over the contacts el II. At contacts e II the relay V 1 receives current over.; earth, contact o II, back contacts o 14 II, wiper I of the auxiliary switch in position O, relay" V 1, battery, earth. The back contacts o III open,'thus preventing the relay interrupter RU (not shown) being operated when the relay V 2 operates and closes the contact v 2 II. As the relay V 1 has been operated and closed contacts c; 1 III, the rotary magnet of the auxiliary switch receives current impulses over the impulsing contacts i 1 (N) during the return motion of the number dial. The rotary magnet operates and rotates the wipers of the auxiliary switch onto the contact corresponding to the number of impulses. At the same time these impulses are transmitted over the contact 27 (N) to the lifting magnet of the final selector (not shown), so that the latter is raised to a certain level. `At the end of the train of impulses, the relay V falls back owing to the opening of the oH-normal contacts e (N) of the number dial. The separation of contacts o II opens the circuit of the relay V 1, which therefore deenerg'izes, because the wiper I of the auxiliary switch has left its normal position O. Now if the grouping of subscribers, who are not entitled to access to certain lines (main exchange lines), be such that they are connected for ex` ample to the levels 4-9 of the final selector, then on dialling any of the numbers 4 9, the wipers of the auxiliary switch are also set onto one of the contacts 4 9, hence upon the release of the relay V 1, the relay ZU is energized, a locking circuit is closed and the further transmission of the impulses is pre vented by the contact su I. The operation of the relay ZU furthermore causes a signal (lamp KL) to be connected up for the operator, to notify the latter that a subscriber has been asked for, who is not entitled to be connected to the main exchange line. The operator then notifies this to the calling party and returns to the normal position all the devices taken into use. This is eected by pressing the key' AZ. Thereby the relay V 2 is operated, namely over: earth, key AZ, contact o 1 II, wiper of the auxiliary switch` relay V 2, battery, earth. Over its contact e 2 I, the relay maintains itself energized independently of thekey AZ. The closing of thc Contact o 2 II causes the rotary magnet of the auxiliary switch to receive impulses over wiper II of the auxiliary switch, contact v III, contact /U 2 III and Contact e 1 II uutil they wiper I reaches its normal position and the relay V 2 falls back.

n'calling from a private distant exchange, the relay E 2 is-energized as before described. Thereby blocking is only eected when a main exchange line connected to the level O is asked for.

What is claimed is:

1. In a telephone system, an automatic switch, a calling device for controlling the operation of said switch, means for connecting said calling device tosaid switch, and means operative independent of the operation of said switch and responsive toa setting operation of said calling device under certain pre- .lli

lan automatic switch variably controlled in accordance with a plurality of settings of said calling device, and means operative independent of the operation of said switch and effective under certain vpredetermined conditions for disabling said calling device, providing a certain one of' said settings is in accordance with a particular digit.

8. In a telephone system, a first and a second trunk line, an automatic switch for extendingcalls from either trunk line, a calling device for controlling the operation of said switch, and means operative independent of the operation of said switch and eective when a callis extended from one of said trunk lines and ineffective when a call is extended from the other of said trunk lines and responsive to a setting operation of said calling device, providing said setting operation is in accordance with a particular digit, for preventing the extension of the call.

4. In a telephone system, a first and a second trunk line, automatic switches for extending calls from either trunk line, a vcalling' device for controlling the operation of said switches in accordance with a plurality of set-- tings, and means for disabling'- said calling device effective when a call is extended from one of said trunk lines providing one of said settings is in accordance with any one of a particular set of digits', and 'effective only when a call is extended from the otherof said trunk lines `providing one of said settings is in accordance witha particular one of said set of digits. n

5. In a telephone system, a first and a second trunk line, automatic switches for extending calls from either trunk line, a calling device for controlling the operation of said switches in accordance with a plurality of settings, means for disabling said calling device efi'ective when a call is extended from one of said trunk lines providing one of said set-` tings is in accordance with any one of a particular set of digits, and eHective only when a call is extended from the other of said trunk lines providing one of said settings-is in accordance with a particular one of said set ofy digits, a signal, and means for operating said signal whenever said calling device is disabled.

6. In a telephone system, a first and a second trunk line, a calling device for sending impulses corresponding to a series of digits over either trunk line, and means for preventi ing the sending of' impulses over one trunk line corresponding to any series in which one of the digits is a Vparticular number, and for preventing the sending of impulses over the other trunk line corresponding to any series in which'said one of the digits is anyof a particular plurality of'numbers.

A 7. In a telephone system, an automatic switch, a calling devicefor sending a plurality of series of impulses to said automatic switchv tof'v operate the switch,` an auxiliary switch yand means for operating the same: in

accordance with oneseries of impulses `sent to said automatic switch, and -meansf con# trolled by said 'auxiliary switch providingit is operated to a certain position for disabling said callingvdevice.

8..In a telephone system, a first and a second trunk line, a calling device for sending a plurality of series of impulses over either of said trunk lines, an auxiliary switch and means forV operating the same in accordance with one series of impulses, means controlled by said switch providing it is operated to a Vcertain position for disabling said calling device, and separate means for each trunk for t determining to what certain position the switch must be operated to become effective.

9. In a telephone system in which calls from one exchange over trunk lines to another exchange are extended to the called subscribersV lines by means oi automatic switches operated under the control of a calling device,

digit registering meansassociated vwith theV calling device for preventing the extension of 'connections over certainy of the trunk lines to certain of the subscribers lines.

Vl0. `In Va teleplionesystem in which calls from one exchange over trunk lines to another exchange are extended to the Icalled subscribers7 lines by means of automatic switches.

operated under the control of'a calling device, digit registering means associated with `the calling device for preventing the extension of connections over certain of the ltrunk lines to certain ofthe subscribers,lines,gand for preventing the extension of connections over certain other of the trunks lines to certain other'lines.

1l. In a telephone system, a trunk line, a callingdevice for sending series of impulses over said trunk'line, an auxiliary switch and means for operating it during the sending of' one series of impulses over said trunk line and in accordance with said one series,y and means controlled by said switch providing itis operiio ated to a certain position for preventing the f i further sending of impulses over said trunk .n

line.

12. In a telephone system, a trunl: line, a calling device for sending series of impulses over said trunk line, an auxiliary switch and means for operating it during the sending of iizo one series of impulses over said trunk line and in accordance with said one series, means controlled by said switch providing it' is op-A erated to a Icertain position for preventing'the further sending of impulses over said-trunk line, and means for preventing the further. operation. of said switch during the Jfurther sending of impulses over saidtrunk. line when such further sending is not prevented. 13. In a telephone system, an automatic switch for extending a connection, a calling device havinv a dial a set of im ulse contacts in said Calling device eontrolledhy said dial for operating said switch, a register switch, `and a second set of impulse contacts in said calling device controlled by said dia-l simultaneously with said lirstset for operating said register switch.

Y In Witness whereof, I hereunto subscribe my name this 14th day of June, ArD. 1927.

` OTTO ANDERS. 

